661064700715101 has 80 divisors (see below), whose sum is σ = 1008987934711680. Its totient is φ = 431175464254080.

The previous prime is 661064700715087. The next prime is 661064700715103. The reversal of 661064700715101 is 101517007460166.

661064700715101 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 6 + 470 + 0 + 71 + 5 + 101 = 666.

It is not a de Polignac number, because 661064700715101 - 2⁶ = 661064700715037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661064700715103) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3507196606 + ... + 3507385088.

It is an arithmetic number, because the mean of its divisors is an integer number (12612349183896).

Almost surely, 2^{661064700715101} is an apocalyptic number.

It is an amenable number.

661064700715101 is a deficient number, since it is larger than the sum of its proper divisors (347923233996579).

661064700715101 is a wasteful number, since it uses less digits than its factorization.

661064700715101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190848 (or 190839 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 661064700715101 in words is "six hundred sixty-one trillion, sixty-four billion, seven hundred million, seven hundred fifteen thousand, one hundred one".